need help with xpr's PostScript conversion

Thread View: comp.lang.postscript

1 messages

[T] Back to Threads [V] Tree View [G] Group Articles

1 total messages Started by Stephen Friedl Tue, 06 Oct 1992 18:15

#3958

Author: Stephen Friedl
Date: Tue, 06 Oct 1992 18:15

32 lines
1636 bytes

Hi folks,

     Perhaps this belongs in the X newsgroup, but I don't feel
real at home there -- PostScript is more my thing.  I support a
PostScript interpreter for the V-Systems VSI*FAX product, and
a customer has reported a problem converting X window dump files
into the .fax format.

     The window dump is all grayscale, with white letters, and
the problem is the grayscale background -- it's a 50% halftone.
Those of you familiar with the T.4 encoding scheme know that this
is about the theoretically worst possible pattern to send, and
we're seeing 15- and 20-minute transmission times for a single
page.

     Normally I would just set a different screen or modify the
transfer function, but it seems that xpr is converting the
halftone into the ultimate on-and-off bits -- we get a one-bit
deep image with no useful grayscaling information to shortcut
around.

     I am not real motivated to learn X, and if somebody else
has already gone down this road, it would help me a lot.  In
the meantime, I'll be trudging through the source to xpr...

     Stephen

-- 
Stephen J Friedl | Software Consultant | Tustin, CA |     +1 714 544-6561
3b2-kind-of-guy  | I speak for me ONLY |   KA8CMY   | uunet!mtndew!friedl
 
Attorneys are paranoid because they assume everybody else is dishonest too

Thread Navigation

This is a paginated view of messages in the thread with full content displayed inline.

Messages are displayed in chronological order, with the original post highlighted in green.

Use pagination controls to navigate through all messages in large threads.

Back to All Threads